A conventional color conversion apparatus was associated with a problem of generation of an achromatic component and reduction in the luminance.A color conversion apparatus according to the present invention generates new color data corresponding to color red of red, green and blue by means of matrix calculation using a first calculation term which is effective for just one of the hues of red, yellow, blue, green, cyan, magenta and yellow, and a second calculation term which is calculated from the first calculation term and which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-magenta, and magenta-red, so that color conversion can be achieved without generation of an unnecessary achromatic component or reduction in the luminance.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A color conversion apparatus comprising: means for generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on color data representing colors of red, blue, and green; means for generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; means for generating matrix coefficients for said first calculation term, and said second calculation term; means for generating new color data corresponding to said color data, by means of matrix calculation using said matrix coefficients, said first calculation term, and said second calculation term; and means for designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
2. The color conversion apparatus according to claim 1 , wherein said means for generating said first calculation term comprises: means for generating a maximum value and a minimum value of said color data; and means for generating said first calculation term based on said color data, said maximum value and said minimum value.
3. The color conversion apparatus according to claim 1 , further comprising means provided in front of said means for generating said first calculation term for converting tone characteristics of the color data.
4. The color conversion apparatus according to claim 1 , further comprising means provided in front of means for displaying image by means of the new color data for converting tone characteristics of the new color data.
5. A color conversion apparatus comprising: means for calculating complementary color data representing cyan, magenta and yellow, based on color data representing red, green and blue; means for generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on the complementary color data; means for generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; means for generating matrix coefficients for said first calculation term, and said second calculation term; means for generating new complementary color data corresponding to said complementary color data, by means of matrix calculation using said matrix coefficients, said first calculation term, and said second calculation term; and means for designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
6. The color conversion apparatus according to claim 5 , wherein said means for generating said first calculation term comprises: means for generating a maximum value and a minimum value of said complementary color data; and means for generating said first calculation term based on said complementary color data, said maximum value and said minimum value.
7. The color conversion apparatus according to claim 5 , further comprising means provided in front of said means for calculating the color data for converting tone characteristics of the complementary color data.
8. The color conversion apparatus according to claim 5 , further comprising means provided in front of means for outputting image by means of the new complementary color data for converting tone characteristics of the new complementary color data.
9. A color conversion apparatus comprising: means for generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on color data representing colors of red, blue, and green; means for generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; means for calculating achromatic data representing an achromatic component of said color data; means for generating matrix coefficient for said first calculation term, said second calculation term, and said achromatic data; means for generating new color data corresponding to said color data, by means of matrix calculation using said matrix coefficients, said first calculation term, said second calculation term, and said achromatic data; and means for designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
10. The color conversion apparatus according to claim 9 , wherein said means for generating said first calculation term comprises: means for generating a maximum value and a minimum value of said color data; and means for generating said first calculation term based on said color data, said maximum value and said minimum value.
11. The color conversion apparatus according to claim 9 , further comprising means provided in front of said means for generating said first calculation term for converting tone characteristics of the color data.
12. The color conversion apparatus according to claim 9 , further comprising means provided in front of means for displaying image by means of the new color data for converting tone characteristics of the new color data.
13. A color conversion apparatus comprising: means for calculating complementary color data representing cyan, magenta and yellow, based on color data representing red, blue and green; means for generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on the complementary color data; means for generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; means for calculating achromatic data representing an achromatic component of said color data; means for generating matrix coefficients for said first calculation term, said second calculation term, and said achromatic data; means for generating new complementary color data corresponding to said complementary color data, by means of matrix calculation using said matrix coefficients, said first calculation term, said second calculation term, and said achromatic data; and means for designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
14. The color conversion apparatus according to claim 13 , wherein said means for generating said first calculation term comprises: means for generating a maximum value and a minimum value of said complementary color data; and means for generating said first calculation term based on said complementary color data, said maximum value and said minimum value.
15. The color conversion apparatus according to claim 13 , further comprising means provided in front of said means for calculating the complementary color data for converting tone characteristics of the complementary color data.
16. The color conversion apparatus according to claim 13 , further comprising means provided in front of means for outputting image by means of the new complementary color data for converting tone characteristics of the new complementary color data.
17. A color conversion method comprising the steps of: generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on color data representing colors of red, blue, and green; generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; generating matrix coefficients for said first calculation term, and said second calculation term; generating new color data corresponding to said color data, by means of matrix calculation using said matrix coefficients, said first calculation term, and said second calculation term; and designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
18. The color conversion method according to claim 17 , wherein said step of generating said first calculation term comprises the steps of: generating a maximum value and a minimum value of said color data; and generating said first calculation term based on said color data, said maximum value and said minimum value.
19. The color conversion method according to claim 17 , wherein said first calculation term is generated after tone characteristics of the color data is converted.
20. The color conversion method according to claim 17 , wherein tone characteristics of the new color data is converted.
21. A color conversion method comprising the steps of: calculating complementary color data representing cyan, magenta and yellow, based on color data representing red, green and blue; generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on the complementary color data; generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; generating matrix coefficients for said first calculation term, and said second calculation term; generating new complementary color data corresponding to said complementary color data, by means of matrix calculation using said matrix coefficients, said first calculation term, and said second calculation term; and designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
22. The color conversion method according to claim 21 , wherein said step of generating said first calculation term comprises the steps of: generating a maximum value and a minimum value of said complementary color data; and generating said first calculation term based on said complementary color data, said maximum value and said minimum value.
23. The color conversion method according to claim 21 , wherein the complementary color data is calculated after tone characteristics of the color data is converted.
24. The color conversion method according to claim 21 , wherein tone characteristics of the new complementary color data is converted.
25. A color conversion method comprising the steps of: generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on color data representing colors of red, blue, and green; generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; calculating achromatic data representing an achromatic component of said color data; generating matrix coefficients for said first calculation term, said second calculation term, and said achromatic data; generating new color data corresponding to said color data, by means of matrix calculation using said matrix coefficients, said first calculation term, said second calculation term, and said achromatic data; and designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
26. The color conversion method according to claim 25 , wherein said step of generating said first calculation term comprises the steps of: generating a maximum value and a minimum value of said color data; and generating said first calculation term based on said color data, said maximum value and said minimum value.
27. The color conversion method according to claim 25 , wherein said first calculation term is generated after tone characteristics of the color data is converted.
28. The color conversion method according to claim 25 , wherein tone characteristics of the new color data is converted.
29. A color conversion method comprising the steps of: calculating complementary color data representing cyan, magenta and yellow, based on color data representing red, blue and green; generating a first calculation term which is effective for at least one of the hues of red, blue, green, cyan, magenta and yellow, based on the complementary color data; generating a second calculation term which is effective for a predetermined inter-hue region included in at least one of inter-hue zones of red-yellow, yellow-green, green-cyan, cyan-blue, blue-magenta and magenta-red, based on the first calculation term; calculating achromatic data representing an achromatic component of said color data; generating matrix coefficients for said first calculation term, said second calculation term, and said achromatic data; generating new complementary color data corresponding to said complementary color data, by means of matrix calculation using said matrix coefficients, said first calculation term, said second calculation term, and said achromatic data; and designating the inter-hue zone and the inter-hue region for which said second calculation term is effective.
30. The color conversion method according to claim 29 , wherein said step of generating said first calculation term comprises the steps of: generating a maximum value and a minimum value of said complementary color data; and generating said first calculation term based on said complementary color data, said maximum value and said minimum value.
31. The color conversion method according to claim 29 , wherein the complementary color data is calculated after tone characteristics of the color data is converted.
32. The color conversion method according to claim 29 , wherein tone characteristics of the new complementary color data is converted.
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April 13, 2001
November 14, 2006
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